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Reply by JBrow

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Posted on Chances of my piece blowing up?

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JBrow

1368 posts in 1370 days


#1 posted 05-08-2017 10:14 PM

BalsaWood,

It is difficult to say what might happen as time goes by. If the back absorbs enough moisture, the back could try to bow as the back expands across it width. With shelves holding the back in place, the stress from the expansion could result in some cracking in the back. I doubt that a ¼” thick back would exert sufficient force to loosen some joinery.

If the back loses enough moisture, as the back tries to shrink, the back could crack.

Short of major surgery, ensuring several coats of a film finish on both faces of the back could retard enough moisture from entering or leaving the back so that no problems would ever occur.

If the shelves were attached to the back with screws through slots cut perpendicular to the grain direction in the back and an expansion/contraction gap provided where the back meets the sides, the back would be free to move which, I would think, would avoid any problems.


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